reporter: vice president biden went further in a fiery speech in new hampshire. we will follow them to the gates of hell until they are brought to justice. reporter: but exactly how or what the u.s. military will do against isis, on that, president obama was vague. this is not going to be a one week or one month or six month proposition. reporter: an urgent search for the remaining two u.s. and british hostages is being carried out by spy planes and satellites around an isis stronghold in syria. and investigators are scrambling to try and identify the man seen in these two videos, showing the executions of american journalist steven sotloff and james foley. i m back, obama. reporter: investigators are looking at isis fighters who make appearances. see how the camera pans and briefly catches a glimpse of one of the isis camera operators and another driving a truck, both
that already sounded like a hollywood script. his green light to a real-life drama in the skinny on this thursday, september 4th. announcer: from abc news, this is world news now. good morning to you. i m reena ninan. i m tahman bradley. why don t we get right to our top story, more about isis. the continued fallout from the murder of american journalist steven sotloff. mourners gathered at a candlelight vigil at the university of central florida which he attended. syrian-american students helped organize it. meanwhile investigators are analyzing the video that shows sotloff s execution, seeking clues about his killers, while a family member speaks out. we will not allow our enemies to hold us hostage with the sole weapons they possess fear. that sentiment echoed by world leaders including president obama and the british prime minister as well, as the u.s. considers a new raid to free western hostages held by isis in syria.
saving money at your favorite stores as we go undercover to reveal some retailers biggest secrets. it s thursday, september 4th. announcer: from abc news, this is world news now. good morning. i m reena ninan. and i m tahman bradley. we made it to thursday. i know. we begin this morning with isis, as we have been beginning with all week long. the vice president now saying that we will follow isis to the gates of hell. that s right. we heard from the family of the murdered journalist, steven sotloff, in fact, islamic militants was one of the focuses of today. and his family saying that steven sotloff dedicated his life to portraying the suffering of people in war zones, but he was no hero. sotloff remembered last night in a candle light vigil at his alma mater, the university of central florida. abc s chief investigative correspondent brian ross reports on the search for sotloff s killers.
this morning on world news this morning on world news now urgent manhunt. the aggressive search for isis rebels responsible for beheading americans. this morning on world news now urgent manhunt. the aggressive search for isis rebels responsible for beheading americans. the united front against terror. we will not allow our enemies to hold us hostage with the sole weapons they possess fear. as friends of journalist steven sotloff speak up. safety demands. just days into the school year. students are hurt in a deadly school bus crash. why are seatbelts missing on so many buses? yes, there would be an added cost if there was a retrofit. the price of keeping students safe. and later, deep discounts.
reporter: the urgent search for the remaining two u.s. and other western hostages is being carried out by spy planes and satellites over the isis stronghold of the syrian city of raqqah. this is where u.s. officials believe isis staged its barbaric murders of journalists steven sotloff and james foley. the president vowed isis will pay the price. we will not be intimidated. their horrific acts unite us as a country and stiffen the resolve to take the fight against these terrorists. reporter: the isis commander abu bakr al-baghdada are key, and so are the masked men in the videos and those not seen are part of the execution and video team. those who make the mistake of harming americans learn that well will not forget, our reach is long and justice will be served. reporter: in the search for clues, some gruesome isis videos offer unintended leads. here the camera pans and briefly